/*
 * Copyright 2009 SHOP.COM
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.shop.opensocial.mediated.shindig.request;

import com.shop.opensocial.mediated.request.MediatedRequest;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * Filter for setting the Mediated request instance
 *
 * @author Jordan Zimmerman
 */
public class MediatedServletFilter implements Filter
{
	@Override
	public void destroy()
	{
		// nop
	}

	@Override
	public void init(FilterConfig filterConfig) throws ServletException
	{
		// nop
	}

	@Override
	public void doFilter(final ServletRequest servletRequest, final ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException
	{
		fRequest.set
		(
			new MediatedRequest()
			{
				@Override
				public HttpServletRequest getServletRequest()
				{
					return (HttpServletRequest)servletRequest;
				}

				@Override
				public HttpServletResponse getServletResponse()
				{
					return (HttpServletResponse)servletResponse;
				}
			}
		);
		try
		{
			filterChain.doFilter(servletRequest, servletResponse);
		}
		finally
		{
			fRequest.set(null);
		}
	}

	public static MediatedRequest		getRequest()
	{
		return fRequest.get();
	}

	private static final ThreadLocal<MediatedRequest>						fRequest = new ThreadLocal<MediatedRequest>();
}
